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Toxicity to terrestrial plants

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Description of key information

Hydrogen bromide (HBr) forms hydrobromic acid in water.  The toxic effect seen to organisms is from the acidity of the resulting solution, which is a function of the HBr concentration. Though there are minimal data on hydrogen bromide (HBr) available there are sufficient information available on the analogue substance hydrogen chloride (HCl). (Read-across justification Section 8.6 Repeat dose studies).
Evaluation of the analogous substance hydrogen chloride under the OECD ICCA HPV Programme (2003) stated that it was not considered useful to calculate a PNEC for hydrochloric acid because factors such as the buffer capacity, the natural pH and the fluctuation of the pH are very specific for a certain ecosystem. Hydrobromic acid will react in the same manner as hydrochloric acid, so the evaluation is equally valid for hydrobromic acid. HBr in water forms hydrobromic acid which dissociates to ions (H+ and Br-).
Toxicity data for the bromide ion is available in other submissions so adequate information for environmental classification and labelling of the dissociation products of hydrobromic acid is available. Due to solubility and dissociation of HBr in water, there will be no direct or indirect exposure to the terrestrial compartment.

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Additional information

HBr forms hydrobromic acid in water. The toxic effect seen to organisms is from the acidity of the resulting solution, which is a function of the HBr concentration. Though there are minimal data on hydrogen bromide (HBr) available there are sufficient information available on the analogue substance hydrogen chloride (HCl). (Read-across justification Section 8.6 Repeat dose studies).

Evaluation of the analogous substance hydrogen chloride under the OECD ICCA HPV Programme (2003) stated that it was not considered useful to calculate a PNEC for hydrochloric acid because factors such as the buffer capacity, the natural pH and the fluctuation of the pH are very specific for a certain ecosystem. Hydrobromic acid will react in the same manner as hydrochloric acid, so the evaluation is equally valid for hydrobromic acid. HBr in water forms hydrobromic acid which dissociates to ions ( H+and Br-).

Toxicity data for the bromide ion is available in other submissions so adequate information for environmental classification and labelling of the dissociation products of hydrobromic acid is available. Due to solubility and dissociation of HBr in water, there will be no direct or indirect exposure to the terrestrial compartment.